One of my professors is a very brilliant but somewhat "socially absent" man, and he told this story to our class. He said that after grades were released a girl came by his office to talk to him about hers, dressed to the nines with a lollipop in her mouth. His initial thought was "That's weird, why is she so dressed up in skimpy clothes, she usually wears hoodies and sweats" but he didn't think anything else of it. She then asked if there was anything she could do to raise her grade. He said no, explaining that grades were already in. She leaned over the desk, right in his face, and asked if there was *anything* she could do to raise her grade. He had to explain twice more that sorry, all opportunities for extra credit and the like had passed because he couldn't alter grades once they'd been turned in. He thought about it some more. He asked his wife if she thought something weird was going on, at which point his wife shook her head and good-naturedly said "Hon, you're an idiot."
((Personally, I'd call the student the idiot in this scenario, not the well-meaning professor. xD ))